Motorola MCF5281, MCF5282 user manual Stop Mode Operation Sheet 5, Lose reference, Clock, Modes

Functional Description

Table 9-10. Stop Mode Operation (Sheet 5 of 5)

MODE

LOCEN

LOCRE

LOLRE

PLL

OSC

FWKUP

Expected

PLL Action

MODE

LOCKSS

LOCK

LOCS

Stop

PLL

In

Action at

During Stop

Out

SCM

1

0

0

On

On

1

—

—

SCM

0

0

1

Lose reference

SCM

clock

Note:

PLL = PLL enabled during STOP mode. PLL = On when STPMD[1:0] = 00 or 01

OSC = Oscillator enabled during STOP mode. Oscillator is on when STPMD[1:0] = 00, 01, or 10

MODES

Comments

NRM = normal PLL crystal clock reference or normal PLL external reference or PLL 1:1 mode. During PLL 1:1 or normal external reference mode, the oscillator is never enabled. Therefore, during these modes, refer to the OSC = On case regardless of STPMD values.

EXT=external clock mode

REF=PLL reference mode due to losing PLL clock or lock from NRM mode SCM=PLL self-clocked mode due to losing reference clock from NRM mode RESET= immediate reset

LOCKS

‘LK= expecting previous value of LOCKS before entering stop

0–>‘LK= current value is 0 until lock is regained which then will be the previous value before entering stop 0–> = current value is 0 until lock is regained but lock is never expected to regain

LOCS

‘LC=expecting previous value of LOCS before entering stop

1–>‘LC= current value is 1 until clock is regained which then will be the previous value before entering stop 1–> =current value is 1 until clock is regained but CLK is never expected to regain

MOTOROLA Chapter 9. Clock Module 9-21